Aryl and cycloalkyl substituted naphthols

ABSTRACT

Aryl and cycloalky substituted naphthols, e.g., 3-pchlorophenyl-1-naphthol or 1,2,3,4-tetrahydroanthracen-9-ol are prepared by the acid rearrangement of benzoic acid lactones and are useful as antimicrobial agents.

United States Patent [1 1 Houlihan et'al.

[45] Sept. 25, 11973 ARYL AND CYCLOALKYL SUBSTITUTED NAPI-ITHOLS [75] Inventors: William J. Houlihan, Mountain Lakes; Jeffrey Nadelson, Parsippany,

both of NJ.

[73] Assignee: Sandal-Wander Inc., Hanover, NJ.

[22] Filed: Apr. 14, 1971 21 App]. No.: 134,040

[52] US. Cl. 260/619 F, 260/613 R, 260/343.2, 260/559 R, 424/346 [51] Int. Cl. C07c 39/14 [58] Field of Search 424/347; 260/620,

260/619 F, 619 D, 613 R [56] References Cited OTHER PUBLICATIONS Elseviers Encyclopedia of Organic Chemistry, Series III, Vol. 123, (1950), P ges 1444, 1456, 1457.

Elseviers Encyclopedia of Organic Chemistry, Series III, Vol. 13, (1946), pages 279-281.

Primary Examiner-Bernard Helfin Att0rneyGerald D. Sharkin, Thomas C. Doyle, Robert S. Honor, Walter F. Jewell, Thomas O. McGovern, Richard E. Vila and Frederick H. Weinfeldt [5 7] ABSTRACT 5 Claims, N0 Drawings ARYL AND CYCLOALKYL SUBSTITUTED NAPHTHOLS The invention relates to l-naphthol derivatives. In particular this invention concerns 3-aryl substituted and 2,3-cycloalkyl substituted naphthols, intermediates and processes used in their preparation and their use as antimicrobials.

The compounds of this invention may be represented by the following structural formula:

and the like or R represents R represents hydrogen, halo having an atomic weight of about 19 to 36, trifluoromethyl, lower alkyl as defined above or lower alkoxy, i.e. alkoxy having 1 to 4 carbon atoms, e.g., methoxy, ethoxy, isopropoxy and the like or R and R, together represent (CH2)n where n is an integer of from 4 to provided trifluorov methyl groups are not bonded to adjacent carbon atoms. The compounds of theformula p is 5 to 10 and R, and R are as defined especially preferred. The compounds of formula (I) may be prepared in accordance with the following reaction scheme above are R R R R and the proviso, arev set out above.

The compounds of formula I are prepared by treating a compound of formula II with polyphosphoric acid. The polyphosphosporic acid can be any of the known polyphosphosphoric acids or modified polyphosphoric acids. Although a solvent is not essential, it is preferred that the reaction be run in excess polyphosphoric acid. If desired, a hologenated aliphatic hydrocarbon such as methylene dichloride can be used as the solvent or as a cosolvent. The temperature at which the reaction is run is not critical, but it is preferred that the reaction be carried out between and 120C, especially between to l 10C. For optimum results, the reaction should be run for 10 minutes to 1 hour, The product (I) is recovered by convention techniques, e.g., extraction and evaporation.

The compounds of formula I] are novel and may be prepared according to the following process 0 C-NH I cum; Rz -CHzC-CH2R3 R2 I R4 Hi III II where R R R R and the proviso are as set out previously. The compounds of formula II are prepared by heating a compound of formula III. Although a solvent is not essential, it is preferred that the reaction be run in an inert solvent, e.g. benzene, toluene, xylene, and hologenated hydrocarbon such as chlorobenzene and dichlorobenzene. The temperature at which the reaction is run is not critical, but it is preferred that the reaction be carried out between about 70 and 200C, expecially at the reflux temperature of the medium. For optimum results, the reaction should be run for 12 hours to 48 hours, preferably 18 to 24 hours, although the time is not critical. The product (I) is recovered by convention techniques, e.g., evaporation.

The compounds of formula III except those in which R and R, is

are novel and may be prepared according to the following reaction scheme and R; represents where m, R, and the proviso are as set out above or R and R together represent where p is an integer between 5 to 10.

The compounds of formula III are prepared by treating a compound of formula IV with a carbonyl compound of formula V. Although a solvent is not essential, it is preferred that the reaction be run in excess carbonyl of formula V or in ethers such as diethyl ether or tetrahydrofuran or in hydrocarbons such as hexane, benzene, toluene and the like. Ether and tetrahydrofuran are especially preferred. The temperature at which the reaction is run is not critical, but it is preferred that the reaction be carried out between 40C and 35C, especially between -30 and C. For optimum results, the reaction should be run for 4 to 16 hours, preferably 8 to l0 hrs. although the time is not critical. The product (I) is recovered by convention techniques, e.g., evaporation.

The compound of formula III which is a-( lhydroxycyclohexyl)-N-methyl-a-t0luamide and many of the compounds of formula IV and V are known and may be prepared by methods disclosed in the literature, e.g., the compounds of formula IV can be prepared by treating the corresponding toluamide with an alkyl lithium such as n-butyl lithium using standard techniques. The compound of formula IV and V not specifically disclosed in the literature may be prepared by analogous techniques using known starting materials.

The compounds represented by formula (I) above are useful as antimicrobial agents as indicated by their activity at concentrations of 1 to 100 micrograms/ml in vitro against organisms such as staphylococcus aureus, streptococcus faecalis, bacillus subtilis, escherichia coli, proteus vulgaris, histoplasma capsulatum, candida albicans, aspergillus niger, and the like. This is indi- 5 propyl paraben, U.S.P.

cated by their activity when tested using a conventional serial dilution test.

For such usages, compounds (I) may be administered orally, parenterally or topically as such or admixed with conventional pharmaceutical carriers. They can be administered orally in such forms as tablets, dispersible powders, granules, capsules, syrups, and elixirs; parenterally as solutions, suspensions, dispersions, emulsions, and the like, e.g., a sterile injectable aqueous suspension and topically as solutions, salves and the like. These pharmaceutical preparations may contain up to about percent of the active ingredient in combination with the carrier or adjuvant.

Although the antimicrobial effective dosage utilized will vary depending upon the compound employed and the mode of administration, in general, satisfactory results are obtained when these compounds are orally administered for systemic use at a daily dosage of about 3 mg. to about mg. per kilogram of animal body weight. This daily dosage is preferably administered 2 to 4 times a day, or in sustained release form. For most large mammals in need of said treatment the total daily dosage is from about 100 mg. to about 4 gm. Dosage forms suitable for internal use comprise about 25 mg. to about 2.0 g. of active compound in intimate admixture with a solid or liquid pharmaceutically acceptable carrier or diluent.

The preferred pharmaceutical compositions from the standpoint of preparation and ease of administration are solid compositions, particularly hard-filled capsules and tablets containing about 100 to 500 milligrams of active ingredient.

Tablets and capsules containing the ingredients indicated below may be prepared by conventional techniques and are useful as antimicrobial agents at a dose of one tablet or capsule 2 to 4 times a day.

Ingredients Weight (mg.)

tablet capsule 1,2,3 ,4-tetrahydro-anthracen-9-ol 250 Tragacanth Lactose Corn starch Talcum Magnesium steal-ate Weight (mg) sterile injectable liquid suspension suspension Ingredients oral 3-p-chlorophenyl-l-naphthol sodium carboxy methyl cellulose U.S.P. L25 methyl cellulose 0.4 polyvinylpyrrolidone 5 lecithin 3 0.01

benzyl alcohol magnesium aluminum silicate flavor color methyl paraben, U.S.P.

polysorbate 80 (e.g. Tween 80),

sorbitol solution, 70%, U.S.P. buffer agent to adjust pH for desired stability 1 q.s. q.s. water for injection,

q.s. to 1 ml. q.s. to

EXAMPLE I 0C. To this mixture is added dropwise, with stirring over a period of 0.5 hr, 450 ml; of 15% n-butyl lithiumhexane solution (0.72 mole n-Buli). The reaction is stirred an additional 1.5 hr. at room temperature and then cooled to 30C i A solution of 58.5 g(0.38 mole) of p-chloroacetophenone in l50 ml dry tetrahydrofuran is added dropwise. The temperature is allowed to rise to room temperature and is maintained there for about 8 hrs after which 50 ml of saturated am monium chloride is added dropwise. The resultant solids are filtered and the filtrate is concentrated in Vacuo to yield o-(2hydroxy-Z-p-chlorophenylpropyl)-N- methyl benzamide m.p.( 160 161.5 benzene).

Following the above procedure but using an equivalent amount of propiophenone, 3,4- dichloroacetophenone, cyclohexanone, cyclooctanone, or cyclododecanone, in place of the pchloroacetophenone' above there is obtained o-(2- hydroxy-2-phenylbutyl)-N-methylbenzamide (m.p. 123-l25;C H o-(2-hydroxy-2-[3,4- dichlorophenyl]propyl)-N-methylbenzamide (m.p. 74-75;i-C H OH); a-( lhydroxycyclohexyl)-N-methyl-o-toluamide(m.p.167-l69C; C l-I a-( lhydroxycyclooctyl)-N-methyl-o-toluamidc (m.p. l59-160, THF) or 2-(a-l-hydroxycyclododecyl)-N- methyl-o-toluamide, (m.p. l99-205; CH Cl/CH Ol-l).

When the above reaction is carried out using N-methyl-6-chloro-o-toluamide in place of the N- methyl o-toluamide or 4',4"-dichloro-2- phenylacetophenone, p-trifluorom'ethylacetophenone, p-methylacetophenone or p-methoxyacetophenone is used in place of the p-chloroacetophenone there is obtained o-( 2-hydroxy-2-p-chlorophenylpropyl)-N- methyl-p-chloroben-zamide, o-(2hydroxy-2,3-di-[pchlorophenyllpropyl)-N-methyl-benzamide, o-(2- hydroxy-Z-p-tolylpropyl)-N-methyl-benzamide or o-(2- hydroxy-2p-methoxyphenylpropyl)-N-methylbenzamide respectively.

EXAMPLE 2 acid dichlorophenyl]propyl)-N-methylbenzamide in place of the o-(2-hydroxy-2-p-chlorophenylpropyl)-N- methylbenzamide, there is obtained 0-(2-hydroxy-2- phenylbutyl)-benzoic acid lactone, (m.p. 9l.593; Et O); o-(a-lhydroxycyclohexylmethyl) benzoic acid lactone (b.p. l46l50; 1 mm.); o-(a-lhydroxycyclododecylmethyl)benzoic acid lactone (m.p. 134-135"; Et Oli-ProH); o-(a-l-hydroxycyclooctylmethyl) benzoic acid lactone (m.p. 8l.5-82; i-ProH/H O) or o-(2-hydroxy-2-l3,4-dichlorophenyl1- propyl)benzoic acid lactone (m.p. ll4ll5; Et O/pentane)respectively.

When o-(2-hydroxy-2-p-chlorophenylpropyl)-N- methyl-p-chlorobenzamide, o-(2-hydroxy-2,3-di-[pchlorophenyl]propyl)-N-methyl benzamide, o-(2- hydroxy-Z-p-trifluoromethylphenylpropyl)-N-methylbenzamide; o-(2hydroxy-Z-p-tolylpropyl)-N-methylbenzamide; or o-(2hydroxy-2-pmethoxyphenylpropyl)-N-methyl-benzamide is used in place of the o-(2-hydroxy-2p-chlorophenylpropyl)-N- methyl-benzamide above, there is obtained o-(2- hydroxy-2p-chlorophenylpropyl)-p-chlorobenzoic acid lactone, o-(2-hydroxy-2,3-di-[p-chlorophenyl]- propyl)benzoic acid lactone, o-(2-hydroxy 2-ptrifluoromethylphenylpropyl)benzoic acid lactone, o- (2-hydroxy-2-p-tolypropyl)benzoic acid lactone or o- (2-hydroxy-Z-p-methoxyphenylpropyl) benzoic acid lactone respectively.

EXAMPLE 3 3-p-chlorophenyl-lnaphthol Into a flask equipped with a stirrer and thermometer containing 315 g. of polyphosphoric acid heated to ll0 C is added over a period of 20 minutes 20.0g (0.07 moles) of V o-(2-hydroxy-2-p-chlorophenylpropyl)-benzoic acid lactone. After addition is complete the brown solution is poured onto 500 g of ice and extracted twice with 250 ml. of diethyl ether. The ether extracts are combined and dried with anhydrous magnesium sulfate. After filtration, the dried extract is concentrated to yeild 3-p-chlorophenyl-l-naphthol (m.p. l59-l50 C).

Following the above procedure but using an equivalent amount of o-(2-p-chlorophenyl-Z-hydroxybutyl)- benzoic acid lactone, o-(a-lhydroxycyclohexylmethyl) benzoic acid lactone, o-(a-lhydroxycyclododecylmethyl)benzoic acid lactone, o- (a-l-hydroxycyclooctylmethyl) benzoic acid lactone or o-( 2-hydroxy -2-[3,4-dichlorophenypropyl] )benzoic acid lactone in place of the o-(2-hydroxy 2-p-chlorophenylpropyl)-benzoic acid lactone above there is obtained 3p-chlorophenyl-Z-methyll naphthol, 1,2,3 ,4- tetrahydro anthrocen-9-ol(m.p. l02-l04C); 2,3-decamethylene-lnaphthol (m.p. l24-126C); 2,3-hexamethylene -l-naphthol; or 3-(3,4-dichlorophenyl)-l-naphthol respectively.

When an equivalent amount of o-(2-hydroxy-2-pchlorophenylpropyl) p-chlorobenzoic acid lactone, o-(2-hydroxy-2,3-di-[p-chlorophenyl]propyl)-benzoic acid lactone, o-(2-hydroxy-Zp-trifluoromethylphenylpropyl)-benzoic acid lactone, o-(2-hydroxy-2-ptolylpropyI)-benzoic acid lactone or o-(2-hydroxy-2-pmethoxy-phenylpropyl)-benzoic acid lactone is used in place of the o-(2-hydroxy-2p-chlorophenylpropyl)- benzoic acid lactone above there is obtained 6-chloro- 3-p-chlorophenyl-lnaphthol, 2,3-di[p-chlorophenyl]- l-naphthol, B-p-trifluoromethylphenyl -l-naphthol.

3-p-tolyl-l-naphthol, naphthol.

What is claimed is: l. A compound selected from the group consisting of:

or 3-p-methoxyphenyl-lp is 5 to and R, and R are hydrogen.

4. The compound of claim 3 which is 2,3-decamethylene-l-naphthol.

5. A process for preparing a compound of the formula where R and R each independently represent hydrogen or halo having an atomic weight of about 19 to 36; R represents hydrogen, lower alkyl or R represents where m is 1 or 2 and R represents hydrogen, halo having an atomic weight of about 19 to 36, trifluoromethyl, lower alkyl or lower alkoxy or R and R together represent where n is an integer of from 4 to 10 provided trifluoromethyl groups are not bonded to adjacent carbon atoms which comprises rearranging a compound of the formula by treating it with polyphosphoric acid. 

2. The compound of claim 1 which is 3-p-chlorophenyl-1-naphthol.
 3. A compound having the formula
 4. The compound of claim 3 which is 2,3-decamethylene-1-naphthol.
 5. A process for preparing a compound of the formula 